EP0258656B1 - Telescopic device - Google Patents

Telescopic device Download PDF

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Publication number
EP0258656B1
EP0258656B1 EP87111192A EP87111192A EP0258656B1 EP 0258656 B1 EP0258656 B1 EP 0258656B1 EP 87111192 A EP87111192 A EP 87111192A EP 87111192 A EP87111192 A EP 87111192A EP 0258656 B1 EP0258656 B1 EP 0258656B1
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EP
European Patent Office
Prior art keywords
guide
telescopic
guide ring
ring body
carrier sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87111192A
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German (de)
French (fr)
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EP0258656A1 (en
Inventor
Hans-Josef Dipl.-Ing. Hosan
Gregor Dipl.-Ing. Poertzgen
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Stabilus GmbH
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Stabilus GmbH
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Publication of EP0258656A1 publication Critical patent/EP0258656A1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder

Definitions

  • the invention relates to a telescopic device comprising an outer telescopic part with a cavity that has an axis, an inner telescopic part at least partially received by the cavity with an outer guide surface, which is linearly and substantially wobble-free relative to the outer telescopic part in the direction of the axis and an annular guide unit inserted into the outer telescopic part with an inner guide surface arrangement for contacting the outer guide surface of the inner telescopic part.
  • Such telescopic devices occur in particular in chair columns in which the outer telescopic part is formed by a standpipe of the chair column and the inner telescopic part by a casing tube of a gas spring, while the piston rod of the gas spring is firmly connected to a bottom of the standpipe in the axial direction.
  • the object of the present invention is to create a telescopic device, in particular for use as a chair column, in which the inner telescopic part can slide and rotate properly relative to the outer telescopic part and thus axial movement resistances are substantially reduced. Misalignments should be compensated for without creating higher friction or edge pressure. Over a very long period of operation, the wear of the elements involved should be as low as possible. The assembly of the telescopic device should be simplified.
  • the invention is based on a telescopic device comprising an outer telescopic part with a cavity that has an axis, an inner telescopic part at least partially received by the cavity with an outer guide surface, which can move linearly and essentially without wobble relative to the outer telescopic part in the direction of the axis and an annular guide unit inserted into the outer telescopic part with an inner guide surface arrangement for contacting the outer guide surface of the inner telescopic part.
  • At least one inner guide surface section of the inner guide surface arrangement is formed on a guide ring body which is mounted on a support sleeve of the guide unit in a universal joint.
  • the inner telescopic part should be able to move freely within the outer telescopic part, two axially spaced guide points between the outer guide surface and the inner guide surface arrangement must be expected. These guide points are cylindrical surfaces and must be in as precise an axial alignment as possible to ensure perfect, low-friction guidance. If, according to the invention, at least one inner guide surface section of the inner guide surface arrangement is formed on a guide ring body, which is mounted in a universal joint on a carrier sleeve of the guide unit, then the two axially spaced guide points automatically adjust to an approximately exact alignment, so that a perfect guide without essential Canting friction is guaranteed.
  • the guide ring body can be received in an inner circumferential groove on the inside of the carrier sleeve.
  • the circumferential groove can be designed with a hollow spherical partial surface and the guide ring body can be provided with a partially spherical outer surface which rests on the hollow spherical partial surface.
  • the carrier sleeve is formed from two half-shells which, after the guide ring body has been received, are pushed into the cavity and thereby held together.
  • two guide ring bodies are arranged within the carrier sleeve at an axial distance, each of which is mounted in a universal joint relative to the carrier sleeve.
  • a perfect axial alignment is ensured on two cylindrical guide surface sections, since these guide surface sections can be automatically centered against one another in precise axial alignment. This ensures that the outer guide surface of the inner telescopic part friction in two axially spaced cylindrical surfaces poorly managed.
  • Another simple possibility of installing one or more guide ring bodies in a carrier sleeve results from the fact that the carrier sleeve is provided on one section of its axial length with slots open at one end and that the inner circumferential groove is formed in this section. The guide ring body can then be snapped into the inner circumferential groove by spreading the slotted section of the carrier sleeve.
  • the carrier sleeve can be made of plastic or metal, in particular light metal, in particular in the form of an injection molded body.
  • the guide ring body is preferably made of metal or sintered metal and can have a coating made of low-friction material on its inner surface. This coating of low-friction material does not have to be applied directly to the inner surface of the guide ring body, but can also be arranged on the inner surface of a sliding bushing which is inserted with its outer surface into the guide ring body.
  • the outer telescopic part can be formed, for example, by a standpipe of a chair column, which has a bottom at its lower end and is open at its upper end, while, on the other hand, the inner telescopic part can be formed by a casing tube of a gas spring, which is located on the bottom of the standpipe has axially attached piston rod.
  • each of these guide points is preferably formed by a guide ring body which is mounted in the support sleeve in a universal joint.
  • a chair column which comprises an arbitrarily lockable gas spring I.
  • An inner telescopic part or casing tube 2 of the gas spring I is guided in a guide unit 9, which is pressed into the upper end of an outer telescopic part or standpipe 8.
  • the gas spring has a piston rod 3, which is rotatably mounted with its lower end on a bottom 8a of the standpipe 8, axially fixed and with radial play.
  • the casing tube 2 has at its upper end a conical fastening section 2a which can be inserted into a correspondingly conical hollow hub of a chair seat.
  • the standpipe 8 has at its lower end a conical section 8b which can be inserted into a correspondingly conical bore in a chair base.
  • the piston rod 3 is connected within the gas spring 1 to a piston 4 which separates two working spaces 5 and 6 from one another within the gas spring.
  • the two working spaces 5 and 6 are at least partially filled with gas under pressure.
  • the two working spaces 5 and 6 can be connected to one another by an overflow connection 20 bridging the piston 4.
  • This overflow connection 20 is blocked by a valve device 7.
  • the overflow connection 20 can be opened by axial pressure on the valve device 7, so that a fluid exchange can take place between the two working spaces 5 and 6.
  • a certain extension length of the gas spring I is set. In order to change the extension length, the valve device 7 must be opened. Then the pressure medium within the working chambers 5 and 6 tries to push the piston rod 3 out of the gas spring until the valve device 7 is closed again. Part of the work rooms 5 and 6 can also be filled with liquid.
  • the guide unit 9 is shown in detail in FIGS. 2 and 3. It comprises a carrier sleeve 10, which is composed of two partial shells 10a and 10b. On the inside of the carrier sleeve 10, two inner circumferential grooves 12 are formed at an axial distance from one another, each having a hollow spherical surface 13. In the inner peripheral groove 12, a guide ring body II is inserted, which is a partially spherical Has outer surface. In the guide ring body II, a slide bush 14 is inserted, which carries a plastic coating 15. The inner peripheral surface of the plastic coating 15 has a smaller radius than the inner peripheral surface of the carrier sleeve 10.
  • the assembly is carried out as follows.
  • the casing tube 2 of the gas spring I is inserted through the two guide ring bodies II.
  • the guide ring bodies are then inserted into the inner circumferential grooves 12 of the one half-shell 10a.
  • the other half-shell 10b is placed on to complete the carrier sleeve 10.
  • the carrier sleeve 10 is then pushed into the standpipe 8, the lower end of the piston rod 3 passing through the bottom 8a of the standpipe 8.
  • the lower end of the piston rod 3 is now fastened to the base 8a by a locking ring 21.
  • the lower end of the piston rod 3 has radial play in the base 8a.
  • the guide ring body II automatically align when inserting the casing tube 2. Once they are aligned, the casing tube 2 is rigidly and wobble-free received by the support sleeve 10 and thus by the standpipe 8. Since the piston rod 3 has radial play in the base 8a, there is no possibility of the bending moment acting on the piston rod 3, even if the chair seat is loaded eccentrically. Since the guide ring body II with its plastic sliding layers 15 rest against the casing tube 2, a low-friction guidance is ensured. Any temperature-related expansions of the carrier sleeve 10 do not influence the guiding properties. Since the guide ring body II consists of metal, in particular steel, or sintered metal, the inside diameter of the sliding layers 15 remains essentially constant.
  • the guide unit 109 according to FIGS. 4 and 5 differs from the guide unit 9 according to FIGS. I to 3 essentially in that a single guide ring body III is inserted in a universal joint in an inner circumferential groove 112 or in the hollow spherical surface 113 thereof.
  • the carrier sleeve II0 has a closed ring section 117 and, above the closed ring section 117, slots 119 which form spring tongues 119a. Thanks to these slots 119, the upper section of the carrier sleeve 110 can be spread from above by pressing in the guide ring body III until the guide ring body III snaps into the inner circumferential groove 112.
  • the guide ring body III is coated directly with a low-friction plastic layer 115.
  • the casing tube in addition to its guidance in the guide ring body III, can also have a direct guidance in the closed ring section 117. In this way, wobble-free guidance of the casing tube is again obtained. Since the guide ring body III can also adjust itself here, low-friction guidance is also obtained here.

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  • Chairs Characterized By Structure (AREA)
  • Actuator (AREA)

Description

Die Erfindung bezieht sich auf ein Teleskopgerät umfassend ein äußeres Teleskopteil mit einem Hohlraum, der eine Achse hat, ein von dem Hohlraum wenigstens teilweise aufgenommenes inneres Teleskopteil mit einer äußeren Führungsfläche, welches in Richtung der Achse relativ zu dem äußeren Teleskopteil linear und im wesentlichen taumelfrei beweglich ist und eine in das äußere Teleskopteil eingesetzte, ringförmige Führungseinheit mit einer inneren Führungsflächenanordnung zur Anlage an der äußeren Führungsfläche des inneren Teleskopteils.The invention relates to a telescopic device comprising an outer telescopic part with a cavity that has an axis, an inner telescopic part at least partially received by the cavity with an outer guide surface, which is linearly and substantially wobble-free relative to the outer telescopic part in the direction of the axis and an annular guide unit inserted into the outer telescopic part with an inner guide surface arrangement for contacting the outer guide surface of the inner telescopic part.

Solche Teleskopgeräte treten insbesondere bei Stuhlsäulen auf, bei denen das äußere Teleskopteil von einem Standrohr der Stuhlsäule und das innere Teleskopteil von einem Mantelrohr einer Gasfeder gebildet ist, während die Kolbenstange der Gasfeder mit einem Boden des Standrohrs in axialer Richtung fest verbunden ist.Such telescopic devices occur in particular in chair columns in which the outer telescopic part is formed by a standpipe of the chair column and the inner telescopic part by a casing tube of a gas spring, while the piston rod of the gas spring is firmly connected to a bottom of the standpipe in the axial direction.

Behandluna des Standes der TechnikState of the art treatment

Durch die DE-PS I 931 012 ist eine willkürlich blockierbare Gasfeder bekannt, deren Zylinderaußenfläche in einer mit einem Standrohr verbundenen Führungsbuchse gleitend angeordnet ist. Die Führungsbuchse ist in das Standrohr eingepreßt und bildet somit eine weitestgehend starre Gleitführung, auch wenn sie aus einem Kunststoff besteht. Insbesondere bei Anwendung einer derartigen Führung als Stuhlsäule ergibt sich infolge außermittiger Belastung eine Biegebeanspruchung, wodurch Verkantungen zwischen der Zylinderaußenfläche und dem Standrohr auftreten, die sich durch hohe Losbrechkräfte sowie erhöhte Reibung und damit hohe Axialkräfte auf die Führung auswirken. Diese Schwierigkeiten treten auch bei nicht genauer Fluchtung der Gasfeder zum Standrohr auf, wo durch eine aufwendige Nacharbeit erforderlich wird. Nachteilig ist ferner, daß beim Höhenverstellen und bei der Drehbewegung eines mit dem Gasfederzylinder verbundenen Stuhlsitzes relativ zu dem mit einem Stuhlfuß vereinigten Standrohr durch die Reibung und Kantenpressung ein erhöhter Verschleiß der Führungsbuchse auftritt.From DE-PS I 931 012 an arbitrarily lockable gas spring is known, the outer cylinder surface of which is slidably arranged in a guide bush connected to a standpipe. The guide bush is pressed into the standpipe and thus forms a largely rigid sliding guide, even if it consists of a plastic. In particular when such a guide is used as a chair column, bending stress results due to eccentric loading, causing canting between the cylinder outer surface and the standpipe, which affect the guide due to high breakaway forces and increased friction and thus high axial forces. These difficulties also occur when the gas spring is not precisely aligned with the standpipe, where extensive reworking is required. A further disadvantage is that during the height adjustment and during the rotary movement of a chair seat connected to the gas spring cylinder, increased wear of the guide bushing occurs due to the friction and edge pressure relative to the standpipe combined with a chair foot.

Aufgabe der ErfindungObject of the invention

Die Aufgabe der vorliegenden Erfidnung ist es ein Teleskopgerät, insbesondere zur Anwendung als Stuhlsäule zu schaffen, bei dem ein einwandfreies Gleiten und Drehen des inneren Teleskopteils relativ zu dem äußeren Teleskopteil ermöglicht und damit axiale Bewegungswiderstände wesentlich verringert sind. Fluchtungsfehler sollen ausgeglichen werden, ohne daß eine höhere Reibung oder Kantenpressung entsteht. Über eine sehr lange Betriebsdauer soll der Verschleiß der beteiligten Elemente möglichst gering sein. Der Zusammenbau des Teleskopgeräts soll vereinfacht werden.The object of the present invention is to create a telescopic device, in particular for use as a chair column, in which the inner telescopic part can slide and rotate properly relative to the outer telescopic part and thus axial movement resistances are substantially reduced. Misalignments should be compensated for without creating higher friction or edge pressure. Over a very long period of operation, the wear of the elements involved should be as low as possible. The assembly of the telescopic device should be simplified.

Das Wesen der ErfindungThe essence of the invention

Die Erfindung geht aus von einem Teleskopgerät umfassend ein äußeres Teleskopteil mit einem Hohlraum, der eine Achse hat, ein von dem Hohlraum wenigstens teilweise aufgenommenes inneres Teleskopteil mit einer äußeren Führungsfläche, welches in Richtung der Achse relativ zu dem äußeren Teleskopteil linear und im wesentlichen taumelfrei beweglich ist und eine in das äußere Teleskopteil eingesetzte, ringförmige Führungseinheit mit einer inneren Führungsflächenanordnung zur Anlage an der äußeren Führungsfläche des inneren Teleskopteils.The invention is based on a telescopic device comprising an outer telescopic part with a cavity that has an axis, an inner telescopic part at least partially received by the cavity with an outer guide surface, which can move linearly and essentially without wobble relative to the outer telescopic part in the direction of the axis and an annular guide unit inserted into the outer telescopic part with an inner guide surface arrangement for contacting the outer guide surface of the inner telescopic part.

Dabei ist vorgesehen, daß mindestens ein innerer Führungsflächenabschnitt der inneren Führungsflächenanordnung an einem Führungsringkörper ausgebildet ist, welcher universalgelenkig an einer Trägerhülse der Führungseinheit gelagert ist.It is provided that at least one inner guide surface section of the inner guide surface arrangement is formed on a guide ring body which is mounted on a support sleeve of the guide unit in a universal joint.

Da das innere Teleskopteil innerhalb des äußeren Teleskopteils taumelfrei beweglich sein soll, muß mit zwei in axialer Richtung beabstandeten Führungsstellen zwischen der äußeren Führungsfläche und der inneren Führungsflächenanordnung gerechnet werden. Diese Führungsstellen sind Zylinderflächen und müssen im Hinblick auf eine einwandfreie, reibungsarme Führung in möglichst genauer, axialer Flucht liegen. Wenn nun entsprechend der Erfindung mindestens ein innerer Führungsflächenabschnitt der inneren Führungsflächenanordnung an einem Führungsringkörper ausgebildet ist, welcher universalgelenkig an einer Trägerhülse der Führungseinheit gelagert ist, so stellen sich die beiden axial beabstandeten Führungsstellen selbsttätig auf annähernd genaue Flucht ein, so daß eine einwandfreie Führung ohne wesentliche Verkantungsreibung gewährleistet ist.Since the inner telescopic part should be able to move freely within the outer telescopic part, two axially spaced guide points between the outer guide surface and the inner guide surface arrangement must be expected. These guide points are cylindrical surfaces and must be in as precise an axial alignment as possible to ensure perfect, low-friction guidance. If, according to the invention, at least one inner guide surface section of the inner guide surface arrangement is formed on a guide ring body, which is mounted in a universal joint on a carrier sleeve of the guide unit, then the two axially spaced guide points automatically adjust to an approximately exact alignment, so that a perfect guide without essential Canting friction is guaranteed.

Der Führungsringkörper kann in einer Innenumfangsnut an der Innenseite der Trägerhülse aufgenommen sein.The guide ring body can be received in an inner circumferential groove on the inside of the carrier sleeve.

Um eine von Rückstellkräften freie, universalgelenkige Lagerung des Führungsringkörpers in der Trägerhülse zu erhalten, kann man die Umfangsnut mit einer Hohlkugelteilfläche ausführen und den Führungsringkörper mit einer teilkugelförmigen Außenoberfläche versehen, welche an der Hohlkugelteilfläche anliegt.In order to obtain a universal joint mounting of the guide ring body in the carrier sleeve which is free of restoring forces, the circumferential groove can be designed with a hollow spherical partial surface and the guide ring body can be provided with a partially spherical outer surface which rests on the hollow spherical partial surface.

Um den Führungsringkörper leicht in die Trägerhülse einbauen zu können wird vorgesehen, daß die Trägerhülse aus zwei Halbschalen gebildet ist, welche nach Aufnahme des Führungsringkörpers in den Hohlraum eingeschoben und dadurch zusammengehalten sind.In order to be able to easily install the guide ring body in the carrier sleeve, it is provided that the carrier sleeve is formed from two half-shells which, after the guide ring body has been received, are pushed into the cavity and thereby held together.

Nach einer bevorzugten Ausführungsform sind innerhalb der Trägerhülse in axialem Abstand zwei Führungsringkörper angeordnet, deren jeder gegenüber der Trägerhülse universalgelenkig gelagert ist. Bei dieser Ausführungsform ist eine einwandfreie Axialflucht auf zwei zylindrischen Führungsflächenabschnitten gewährleistet, da sich diese Führungsflächenabschnitteselbsttätig gegeneinander in genaue Achsflucht zentrieren lassen. Damit ist gewährleistet, daß die äußere Führungsfläche des inneren Teleskopteils in zwei in axialer Richtung beabstandeten Zylinderflächen reibungsarm geführt ist.According to a preferred embodiment, two guide ring bodies are arranged within the carrier sleeve at an axial distance, each of which is mounted in a universal joint relative to the carrier sleeve. In this embodiment, a perfect axial alignment is ensured on two cylindrical guide surface sections, since these guide surface sections can be automatically centered against one another in precise axial alignment. This ensures that the outer guide surface of the inner telescopic part friction in two axially spaced cylindrical surfaces poorly managed.

Eine andere einfache Möglichkeit des Einbaus eines, oder mehrerer Führungsringkörper in eine Trägerhülse ergibt sich dadurch, daß die Trägerhülse auf einem Teilabschnitt ihrer axialen Länge mit an einem Ende offenen Schlitzen versehen ist und daß die Innenumfangsnut in diesem Teilabschnitt ausgebildet ist. Der Führungsringkörper kann dann in die Innenumfangsnut unter Spreizung des geschlitzten Abschnitts der Trägerhülse eingeschnappt werden.Another simple possibility of installing one or more guide ring bodies in a carrier sleeve results from the fact that the carrier sleeve is provided on one section of its axial length with slots open at one end and that the inner circumferential groove is formed in this section. The guide ring body can then be snapped into the inner circumferential groove by spreading the slotted section of the carrier sleeve.

Die Trägerhülse kann aus Kunststoff oder Metall, insbesondere Leichtmetall ausgebildet sein, insbesondere in Form eines Spritzgußkörpers.The carrier sleeve can be made of plastic or metal, in particular light metal, in particular in the form of an injection molded body.

Der Führungsringkörper besteht bevorzugt aus Metall, oder Sintermetall und kann auf seiner Innenoberfläche eine Beschichtung aus gleitgünstigem Werkstoff tragen. Diese Beschichtung aus gleitgünstigem Werkstoff muß nicht unmittelbar auf der Innenoberfläche des Führungsringkörpers angebracht werden, sondern kann auch auf der Innenfläche einer Gleitbuchse angeordnet sein, welche mit ihrer Außenfläche in den Führungsringkörper eingesetzt ist.The guide ring body is preferably made of metal or sintered metal and can have a coating made of low-friction material on its inner surface. This coating of low-friction material does not have to be applied directly to the inner surface of the guide ring body, but can also be arranged on the inner surface of a sliding bushing which is inserted with its outer surface into the guide ring body.

Das äußere Teleskopteil kann etwa von einem Standrohr einer Stuhlsäule gebildet sein, welches an seinem unteren Ende einen Boden besitzt und an seinem oberen Ende offen ist, während andererseits das innere Teleskopteil von einem Mantelrohr einer Gasfeder gebildet sein kann, welche eine an dem Boden des Standrohrs axial befestigte Kolbenstange aufweist.The outer telescopic part can be formed, for example, by a standpipe of a chair column, which has a bottom at its lower end and is open at its upper end, while, on the other hand, the inner telescopic part can be formed by a casing tube of a gas spring, which is located on the bottom of the standpipe has axially attached piston rod.

Bei solchen Standrohren ist es unerwünscht, die Gasfederkolbenstange zur radialen Festlegung der Gasfeder heranzuziehen. Es ist deshalb notwendig, das Mantelrohr der Gasfeder in der Führungseinheit an zwei in axialem Abstand befindlichen Führungsstellen zu führen. Bevorzugt wird jede dieser Führungsstellen von einem universalgelenkig in der Trägerhülse gelagerten Führungsringkörper gebildet. Es ist aber grundsätzlich auch denkbar, nur eine der Führungsstellen von einem universalgelenkig gelagerten Führungsringkörper zu bilden, vorzugsweise die obere Führungsstelle und die andere Führungsstelle als eine an der Trägerhülse starr angeordnete, in axialer Richtung möglichst kurze zylindrische Führungsfläche auszubilden. Um die Einleitung von Biegekräften in den aus dem Mantelrohr und der Kolbenstange gebildeten Stabkörper zu vermeiden empfiehlt es sich, die Kolbenstange an dem Boden des Standrohrs mit radialem Spiel zu befestigten.With such standpipes, it is undesirable to use the gas spring piston rod for the radial fixing of the gas spring. It is therefore necessary to guide the jacket tube of the gas spring in the guide unit at two guide points located at an axial distance. Each of these guide points is preferably formed by a guide ring body which is mounted in the support sleeve in a universal joint. In principle, however, it is also conceivable to form only one of the guide points from a guide ring body with a universal joint, preferably the upper guide point and the other guide point as a cylindrical guide surface rigidly arranged on the carrier sleeve and as short as possible in the axial direction. In order to avoid the introduction of bending forces into the rod body formed from the casing tube and the piston rod, it is advisable to fasten the piston rod to the bottom of the standpipe with radial play.

Die verschiedenen neuen Merkmale der Erfindung werden insbesondere in den angeführten Patentansprüchen herausgestellt. Diese Patentansprüche sind ein Teil der Offenbarung. Zum besseren Verständnis der Erfindung, ihrer Vorteile und ihrer spezifischen Wirkungen, wird auf die beigefügten Zeichnungen Bezug genommen und auf die Beschreibung dieser Zeichnungen, in denen bevorzugte Ausführungsbeispiele der Erfindung dargestellt sind.The various new features of the invention are particularly emphasized in the cited patent claims. These claims are part of the disclosure. For a better understanding of the invention, its advantages and its specific effects, reference is made to the accompanying drawings and to the description of these drawings, in which preferred exemplary embodiments of the invention are shown.

Kurzbeschreibuna der ZeichnunaenBrief description of the drawings

Die Erfindung wird nun im Detail unter Bezugnahme auf die in den Zeichnungen dargestellte Ausführungsform beschrieben. In den Zeichnungen zeigen:

  • Fig. einen Längsschnitt durch eine Stuhlsäule;
  • Fig. 2 einen Teilschnitt durch das Standrohr und die in das Standrohr eingesetzte Führungseinheit;
  • Fig. 3 eine Draufsicht auf die Führungseinheit;
  • Fig. 4 einen Schnitt entsprechend demjenigen der Fig. 2, durch eine weitere Ausführungsform einer Führungseinheit und
  • Fig. 5 die Draufsicht auf die Führungseinheit gemäß Fig. 4.
The invention will now be described in detail with reference to the embodiment shown in the drawings. The drawings show:
  • Fig. A longitudinal section through a chair column;
  • 2 shows a partial section through the standpipe and the guide unit inserted into the standpipe;
  • 3 shows a plan view of the guide unit;
  • Fig. 4 shows a section corresponding to that of Fig. 2, through a further embodiment of a guide unit and
  • 5 shows the top view of the guide unit according to FIG. 4.

In Fig. I ist eine Stuhlsäule gezeigt, die eine willkürlich blockierbare Gasfeder I umfaßt. Ein inneres Teleskopteil oder Mantelrohr 2 der Gasfeder I ist in einer Führungseinheit 9 geführt, welche in das obere Ende eines äußeren Teleskopteils oder Standrohrs 8 eingepreßt ist. Die Gasfeder besitzt eine Kolbenstange 3, die mit ihrem unteren Ende an einem Boden 8a des Standrohrs 8 drehbar, axial fest und mit radialem Spiel gelagert ist. Das Mantelrohr 2 besitzt an seinem oberen Ende einen konischen Befestigungsabschnitt 2a, welcher in eine entsprechend konische Hohlnabe eines Stuhlsitzes eingeführt werden kann. Das Standrohr 8 besitzt an seinem unteren Ende einen konischen Abschnitt 8b, welcher in eine entsprechend konische Bohrung eines Stuhlfußes eingeführt werden kann. Die Kolbenstange 3 ist innerhalb der Gasfeder 1 mit einem Kolben 4 verbunden, welcher zwei Arbeitsräume 5 und 6 innerhalb der Gasfeder voneinander trennt. Die beiden Arbeitsräume 5 und 6 sind wenigstens zum Teil mit unter Druck stehendem Gas gefüllt. Die beiden Arbeitsräume 5 und 6 sind durch eine den Kolben 4 überbrückende Überströmverbinddung 20 miteinander verbindbar. Diese Überströmverbindung 20 ist durch eine Ventileinrichtung 7 abgesperrt. Durch axialen Druck auf die Ventileinrichtung 7 kann die Überströmverbindung 20 geöffnet werden, so daß ein Fluidaustausch zwischen den beiden Arbeitsräumen 5 und 6 stattfinden kann. Wenn die Ventileinrichtung 7 geschlossen ist, so ist eine bestimmte Ausschublänge der Gasfeder I eingestellt. Um die Ausschublänge zu verändern, muß die Ventileinrichtung 7 geöffnet werden. Dann sucht das Druckmedium innerhalb der Arbeitskammern 5 und 6 die Kolbenstange 3 aus der Gasfeder auszuschieben, bis die Ventileinrichtung 7 wieder geschlossen wird. Ein Teil der Arbeitsräume 5 und 6 kann auch von Flüssigkeit erfüllt sein.In Fig. I a chair column is shown, which comprises an arbitrarily lockable gas spring I. An inner telescopic part or casing tube 2 of the gas spring I is guided in a guide unit 9, which is pressed into the upper end of an outer telescopic part or standpipe 8. The gas spring has a piston rod 3, which is rotatably mounted with its lower end on a bottom 8a of the standpipe 8, axially fixed and with radial play. The casing tube 2 has at its upper end a conical fastening section 2a which can be inserted into a correspondingly conical hollow hub of a chair seat. The standpipe 8 has at its lower end a conical section 8b which can be inserted into a correspondingly conical bore in a chair base. The piston rod 3 is connected within the gas spring 1 to a piston 4 which separates two working spaces 5 and 6 from one another within the gas spring. The two working spaces 5 and 6 are at least partially filled with gas under pressure. The two working spaces 5 and 6 can be connected to one another by an overflow connection 20 bridging the piston 4. This overflow connection 20 is blocked by a valve device 7. The overflow connection 20 can be opened by axial pressure on the valve device 7, so that a fluid exchange can take place between the two working spaces 5 and 6. When the valve device 7 is closed, a certain extension length of the gas spring I is set. In order to change the extension length, the valve device 7 must be opened. Then the pressure medium within the working chambers 5 and 6 tries to push the piston rod 3 out of the gas spring until the valve device 7 is closed again. Part of the work rooms 5 and 6 can also be filled with liquid.

Beim Höhenverstellen des Mantelrohrs 2 gegenüber dem Standrohr 8 gleitet das Mantelrohr 2 in der Führungseinheit 9 Ein Gleiten findet auch dann statt, wenn durch Wechselbelastung auf dem Stuhlsitz das Druckgas innerhalb des Arbeitsraums 6 mehr oder minder stark komprimiert wird.When adjusting the height of the casing tube 2 relative to the standpipe 8, the casing tube 2 slides in the guide unit 9. Sliding also takes place when the compressed gas within the work space 6 is compressed to a greater or lesser extent by alternating loading on the chair seat.

Die Führungseinheit 9 ist in Fig. 2 und 3 im Detail dargestellt. Sie umfaßt eine Trägerhülse 10, die sich aus zwei Teilschalen 10a und 10b zusammensetzt. An der Innenseite der Trägerhülse 10 sind in axialem Abstand voneinander zwei Innenumfangsnuten 12 ausgebildet, die jeweils eine Hohlkugelteilfläche 13 besitzen. In die Innenumfangsnut 12 ist ein Führungsringkörper II eingesetzt, welcher eine teilkugelförmige Außenoberfläche besitzt. In den Führungsringkörper II ist eine Gleitbuchse 14 eingesetzt, welche eine Kunststoffbeschichtung 15 trägt. Die Innenumfangsfläche der Kunststoffbeschichtung 15 hat einen kleineren Radius als die Innenumfangsfläche der Trägerhülse 10.The guide unit 9 is shown in detail in FIGS. 2 and 3. It comprises a carrier sleeve 10, which is composed of two partial shells 10a and 10b. On the inside of the carrier sleeve 10, two inner circumferential grooves 12 are formed at an axial distance from one another, each having a hollow spherical surface 13. In the inner peripheral groove 12, a guide ring body II is inserted, which is a partially spherical Has outer surface. In the guide ring body II, a slide bush 14 is inserted, which carries a plastic coating 15. The inner peripheral surface of the plastic coating 15 has a smaller radius than the inner peripheral surface of the carrier sleeve 10.

Bei der Montage wird wie folgt vorgegangen. Das Mantelrohr 2 der Gasfeder I wird durch die beiden Führungsringkörper II hindurchgesteckt. Die Führungsringkörper werden sodann in die Innenumfangsnuten 12 der einen Halbschale 10a eingelegt.The assembly is carried out as follows. The casing tube 2 of the gas spring I is inserted through the two guide ring bodies II. The guide ring bodies are then inserted into the inner circumferential grooves 12 of the one half-shell 10a.

Die andere Halbschale 10b wird aufgelegt unter Vervollständigung der Trägerhülse 10. Die Trägerhülse 10 wird sodann in das Standrohr 8 eingeschoben, wobei das untere Ende der Kolbenstange 3 den Boden 8a des Standrohrs 8 durchsetzt. Nunmehr wird das untere Ende der Kolbenstange 3 an dem Boden 8a durch einen Sicherungsring 21 befestigt.The other half-shell 10b is placed on to complete the carrier sleeve 10. The carrier sleeve 10 is then pushed into the standpipe 8, the lower end of the piston rod 3 passing through the bottom 8a of the standpipe 8. The lower end of the piston rod 3 is now fastened to the base 8a by a locking ring 21.

Wie aus Fig. I erkennbar, hat das untere Ende der Kolbenstange 3 in dem Boden 8a radiales Spiel. Die Führungsringköper II fluchten sich beim Einlegen des Mantelrohrs 2 selbsttätig aus. Sind sie einmal ausgefluchtet, so ist das Mantelrohr 2 biegesteif und taumelfrei von der Trägerhülse 10 und damit von dem Standrohr 8 aufgenommen. Da die Kolbenstange 3 in dem Boden 8a radiales Spiel hat, besteht keine Möglichkeit der Biegemomenteinwirkung auf die Kolbenstange 3, auch dann nicht, wenn der Stuhlsitz außermittig belastet wird. Da die Führungsringkörper II mit ihren Kunststoffgleitschichten 15 zwangsfrei an dem Mantelrohr 2 anliegen, ist eine reibungsarme Führung gewährleistet. Etwaige temperaturbedingte Ausdehnungen der Trägerhülse 10 beeinflußen die Führungseigenschafen nicht. Da die Führungsringkörper II aus Metall, insbesondere Stahl, oder Sintermetall bestehen, bleibt der Innendurchmesser der Gleitschichten 15 im wesentlichen konstant.As can be seen from FIG. I, the lower end of the piston rod 3 has radial play in the base 8a. The guide ring body II automatically align when inserting the casing tube 2. Once they are aligned, the casing tube 2 is rigidly and wobble-free received by the support sleeve 10 and thus by the standpipe 8. Since the piston rod 3 has radial play in the base 8a, there is no possibility of the bending moment acting on the piston rod 3, even if the chair seat is loaded eccentrically. Since the guide ring body II with its plastic sliding layers 15 rest against the casing tube 2, a low-friction guidance is ensured. Any temperature-related expansions of the carrier sleeve 10 do not influence the guiding properties. Since the guide ring body II consists of metal, in particular steel, or sintered metal, the inside diameter of the sliding layers 15 remains essentially constant.

Die Führungseinheit 109 nach den Fig. 4 und 5 unterscheidet sich von der Führungseinheit 9 nach den Fig. I bis 3 im wesentlichen dadurch, daß ein einziger Führungsringkörper III universalgelenkig in eine Innenumfangsnut 112 bzw. in deren Hohlkugelteilfläche 113 eingesetzt ist. Die Trägerhülse II0 besitzt einen geschlossenen Ringabschnitt 117, und oberhalb des geschlossenen Ringabschnitts 117 Schlitze 119, welche Federzungen 119a bilden. Dank dieser Schlitze 119 kann der obere Teilabschnitt der Trägerhülse 110 durch Eindrücken des Führungsringkörpers III von oben gespreizt werden, bis der Führungsringkörper III in die Innenumfangsnut 112 einschnappt. Der Führungsringkörper III ist bei dieser Ausführungsform unmittelbar mit einer gleitgünstigen Kunststoffschicht 115 beschichtet. Bei dieser Ausführungsform kann das Mantelrohr neben seiner Führung in dem Führungsringkörper III noch eine direkte Führung in dem geschlossenen Ringabschnitt 117 besitzen. Auf diese Weise wird wiederum eine taumelfreie Führung des Mantelrohrs gewonnen. Da sich der Führungsringkörper III auch hier selbst einstellen kann, wird auch hier eine reibungsarme Führung erhalten.The guide unit 109 according to FIGS. 4 and 5 differs from the guide unit 9 according to FIGS. I to 3 essentially in that a single guide ring body III is inserted in a universal joint in an inner circumferential groove 112 or in the hollow spherical surface 113 thereof. The carrier sleeve II0 has a closed ring section 117 and, above the closed ring section 117, slots 119 which form spring tongues 119a. Thanks to these slots 119, the upper section of the carrier sleeve 110 can be spread from above by pressing in the guide ring body III until the guide ring body III snaps into the inner circumferential groove 112. In this embodiment, the guide ring body III is coated directly with a low-friction plastic layer 115. In this embodiment, in addition to its guidance in the guide ring body III, the casing tube can also have a direct guidance in the closed ring section 117. In this way, wobble-free guidance of the casing tube is again obtained. Since the guide ring body III can also adjust itself here, low-friction guidance is also obtained here.

Es wurden spezielle Ausführungsformen der Erfindung dargestellt und beschrieben um die Verwendbarkeit des Erfindungsprinzips zu erläutern. Es wird jedoch darauf hingewiesen, daß die Erfindung auch auf andere Weise verwirklicht werden kann, ohne daß von dem in den Ansprüchen definierten Prinzip abgewichen wird.Special embodiments of the invention have been shown and described in order to explain the usability of the principle of the invention. However, it is pointed out that the invention can also be implemented in other ways without deviating from the principle defined in the claims.

Die Bezugszeichen in den Ansprüchen dienen nur zur Erleichterung des Verständnisses und sind nicht als Beschränkung zu verstehen.The reference symbols in the claims serve only to facilitate understanding and are not to be understood as a limitation.

Claims (14)

1. A telescopic apparatus comprising an outer telescopic part (8) with a cavity having an axis, an inner telescopic part (2) at least partially accommodated by the cavity with an outer guide surface which is adapted for movement in an axial direction in relation to the outer telescopic part (8) in a linear and substantially wobble-free manner and an annular guide unit inserted into the outer telescopic part (8) and with an internal guide surface arrangement adapted to abut on the external guide surface of the inner telescopic part (2), characterised in that at least one inner guide surface portion of the inner guide surface arrangement is formed on a guide ring body (11) which is mounted in the manner of a universal joint on a carrier sleeve (10) of the guide unit (9).
2. A telescopic part according to Claim 1, characterised in that the guide ring body (11) is accommodated in an internal peripheral groove (12) on the inside of the carrier sleeve (10).
3. A telescopic apparatus according to Claim 2, characterised in that the peripheral groove (12) is made with a surface (13) of partially hollow spherical form and in that the guide ring body (11) comprises a partially spherical external surface which rests on the surface (13) of partially hollow spherical form.
4. A telescopic apparatus according to Claim 3, characterised in that the carrier sleeve (10) comprises two half-shells (10a, 10b) which, after receiving the guide ring body (11), are pushed into the cavity and are thus held together.
5. A telescopic apparatus according to Claim 4, characterised in that the two half-shells (10a, 10b) are pressed into the cavity.
6. A telescopic apparatus according to one of Claims 1 to 5, characterised in that two guide ring bodies (11) are disposed with axial spacing within the carrier sleeve (10).
7. A telescopic apparatus according to one of Claims 2 and 3, characterised in that the carrier sleeve (110) is, on a portion of its axial length, provided with slots (119) which are open at one end and in that the internal peripheral groove (112) is formed in this portion.
8. A telescopic apparatus according to one of Claims 1 to 7, characterised in that the carrier sleeve (10) is constructed from synthetic plastics material.
9. A telescopic apparatus according to one of Claims 1 to 7, characterised in that the carrier sleeve (10) is constructed from metal, particularly light metal.
10. A telescopic apparatus according to one of Claims 1 to 9, characterised in that the guide ring body (11) is produced from metal or sintered metal.
11. A telescopic apparatus according to one of Claims 1 to 10, characterised in that the guide ring body (11) has on its internal surface a coating (15) of slip-favouring material.
12. A telescopic apparatus according to Claim 11, characterised in that the coating (15) of slip-favouring material is disposed on the internal surface of a plain bush (14), the external surface of which is inserted into the guide ring body (11).
13. A telescopic apparatus according to one of Claims 1 to 12, characterised in that the outer telescopic part (8) is formed by an upright tube (8) of a chair column which has at its bottom end an end piece (8a) while it is open at its top end and in that the inner telescopic part is formed by a jacket tube (2) of a gas-filled spring (1) comprising a piston rod (3) which is axially fixed to the end piece (8a).
14. A telescopic apparatus according to Claim 13, characterised in that the annular guide unit (9) comprises two axially spaced apart guide ring bodies (11) and in that the piston rod (3) is secured with a radial clearance to the end piece (8a).
EP87111192A 1986-08-09 1987-08-03 Telescopic device Expired - Lifetime EP0258656B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3627138 1986-08-09
DE19863627138 DE3627138A1 (en) 1986-08-09 1986-08-09 GUIDE TELESCOPICALLY SLIDING CYLINDRICAL PARTS

Publications (2)

Publication Number Publication Date
EP0258656A1 EP0258656A1 (en) 1988-03-09
EP0258656B1 true EP0258656B1 (en) 1990-07-11

Family

ID=6307124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111192A Expired - Lifetime EP0258656B1 (en) 1986-08-09 1987-08-03 Telescopic device

Country Status (6)

Country Link
US (1) US4848524A (en)
EP (1) EP0258656B1 (en)
JP (1) JPS6367410A (en)
AU (1) AU595351B2 (en)
DE (2) DE3627138A1 (en)
ES (1) ES2016310B3 (en)

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Also Published As

Publication number Publication date
DE3763634D1 (en) 1990-08-16
JPS6367410A (en) 1988-03-26
AU7607787A (en) 1988-02-11
EP0258656A1 (en) 1988-03-09
DE3627138A1 (en) 1988-02-11
US4848524A (en) 1989-07-18
AU595351B2 (en) 1990-03-29
ES2016310B3 (en) 1990-11-01

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